punith8626 wrote:I Have a tiff file located in my local system and I want to convert it to base64 string.
An that base64 string should render the image back properly and it should work in all browsers.

There is no option to use a base64 string listed in the NConvert 7.00 help file, so presumably it is not currently supported...

Depending on exactly what your needs are, you could Google for possible alternative solutions including possibly on-line conversion tools.